Upload
ting
View
59
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Recent Results From RHIC. Olga Evdokimova University of Illinois at Chicago. Outline: HI program at RHIC Data collection and Detector Setups Selected recent results Jets, jet-like correlations and medium properties Summary and outlook. PHOBOS. BRAHMS. RHIC. PHENIX. STAR. AGS. - PowerPoint PPT Presentation
Citation preview
Recent Results From RHIC
Olga EvdokimovaUniversity of Illinois at Chicago
Outline: HI program at RHIC Data collection and Detector Setups Selected recent results Jets, jet-like correlations and medium properties
Summary and outlook
2HEPFT 2013
Design goal - studies of phase structure of nuclear matter
Relativistic Heavy Ion Collider
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
RHIC BRAHMSPHOBOSPHENIX
STAR
AGS
TANDEMS
Counter-rotating ion beams p U
Maximum center-of-mass energy:
200 GeV for Au+Au500 GeV for pp
3HEPFT 2013
A+A Data Collection
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
STAR
HI Program: QCD matter under Extreme Conditions
sQGP Studies EoS, Eloss in QCD medium ….
Beam Energy Scan QCD critical point search,Onset of deconfinement, Chiral symmetry restoration…
4HEPFT 2013
PHENIX Detector
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Central Arm DetectorsDrift, Pad, Time-Extension
Chambers RICH, EMCal2 arms 90º in 0.7 units of
Muon Arms DetectorsMuTr, MuID, MPC
1.2 < |η| < 2.2(2.4) 3 < |η| < 4
Upgrade (HF physics): VTX,FVTX
5HEPFT 2013
STAR Detector
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
BNL PAC, 21 - 22, 2010
Heavy Flavor Tracker (HFT)
2013+
Time Projection Chamber (TPC)
(-1 ≤ ≤ 1)
Forward GEM Tracker (FGT)
2011+
EMC+EEMC+FMS(-1 ≤ ≤ 4)
Time Of Flight(TOF)
DAQ1000
Muon Telescope Detector (MTD)
2013
6HEPFT 2013
This Talk’s Focus
Angular correlations (with high pT probes) Early stage (pQCD) probes Interactions of created matter with passing particle
Jet quenching Azimuthal anisotropy
Long range correlations
Control over cold matter effects via d+Au?
Initial vs. Final state effects?
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
hadrons
hadrons leadingparticle(suppressed )
suppression
q
q
hadrons
q
q
hadrons
leading particle
in vacuum
in medium
7HEPFT 2013
RAA – the first tool for jet quenching studies
Colorless probes check Ncoll scaling: Direct photons
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
ddpdT
ddpNdpRT
NNAA
TAA
TAA //)( 2
2
High pT hadron suppression: Final state effect in Au+Au
collisions Observation extends to all accessible
pT range
PRL 91 (2003) 072303
PRL 96 (2006) 202301
High density opaque medium
What are the sQGP signatures?
8HEPFT 2013
What are the sQGP Signatures?
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Partonic collectivity Deconfinement
In multiple measurements,example – v2
x
Strong anisotropy in the final state,
including W and f! Low pT - mass ordering, consistency
with hydrodynamic calculations Higher pT – NCQ scaling
STAR: PRL 95, 122301 (2005) PHENIX: PRL 98, 162301 (2007)
9HEPFT 2013
Jet Quenching
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
STAR: PRL 90, 082302 (2003)
Associated pT dependence: Recovering the away side Development of “double-humps” or “shoulders”
PHENIXPRC 78, 014901 (2008)
The discovery plot: disappearance of away side jet
10HEPFT 2013
Correlations in 2D – The Ridge
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
3 < pT,trigger < 4 GeV/cSTAR: PRC 80 (2009) 064912 pt,assoc. > 2 GeV/c
Au+Au central d+Au central
From not-so-recent results: Ridge correlated with jet direction Approximately independent of D and trigger pT
Extends to acceptance boundary and to the highest trigger pT measured Production mechanisms for jet and ridge differ
Until recent, the ridge open question:manifestation of the jet quenching or coincidental nuisance?
11HEPFT 2013
Azimuthal Anisotropy
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Reaction plane (YR)
x
z
y
xy
z
Glauber-based picture:
Early sketch:
Motivation for “vn fit” : Cross-talk between data and theory -
transport model predictions
12HEPFT 2013
Long Range Correlation – Fourier Fits
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Long range correlations near- and away from the trigger could be simultaneously described via higher order vn terms
vn fit results are consistent with flow expectations
cos(Df) cos(2Df) cos(3Df)
+…
PHENIX:QM 2012
STAR preliminary
Comparison with flow:
STAR Preliminary
Alver and Roland,
PRC 81, 054905 (2010)
13HEPFT 2013
All in Hydro?
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
200 GeV Au+Au collisions
Excellent agreement for PHENIX and STAR:v3 ~ v2 in central eventsv3 and higher harmonics ~ centrality independent origin in fluctuations
Centrality and pT dependences of vn well reproduced by hydro calculations
Precision measurements constrain /s
What’s the catch?Unresolved issue of fast thermalizationLong range correlations probe ~10-24s
PRL 110, 012302 (2013)
14HEPFT 2013
Hot Topic: dA (pA) Collisions
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Renewed attention to the “reference”
Understanding cold nuclear effects
Understanding initial state in HI collisions
CMS
PLB 718, 795 (2013)
High multiplicity pp collisions High multiplicity pPb collisions
15HEPFT 2013
PHENIX: d+Au Correlations
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
A. SicklesMIT pA Workshop
A. SicklesMIT pA Workshop
Ridge in high multiplicity d+Au collisions!
16HEPFT 2013
STAR: d+Au Correlations
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
TPC mult. ||<1
as centrality
0.15 < pTtrig < 3 GeV/c
1 < pTassoc < 2 GeV/c
F. WangRBRC Workshop
STAR PreliminarySTAR Preliminary
Ridge in high multiplicity d+Au collisions?
STAR PreliminaryZYAM-ed
17HEPFT 2013 6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
What is Ridge in d+Au?PHENIX, arXiv:1303.1794
Bozek, PRC85 (2012)
d+Au ridge consistent with hydro predictions? v2/v3 depend strongly on initial state
18HEPFT 2013
Initial vs. Final State EffectsAre we back to the drawing board?
CGC/Glasma:Weak coupling, high intensity color fields
Long-range correlations – induced by color fluctuations
High multiplicity events probe rare gluon configurations
Describes multiplicity in pA, dA, AA Describes vn for different AA centralities at RHIC
and LHC A factor of 2 below data on vn in pPb(?)
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Dusling and Venugopalan, arXiv:1302.7018
19HEPFT 2013
Summary
Ridge correlations in d+Au (needs resolution between the experiments)
Systematic measurements of v2/v3 pT, energy and centrality dependence should address the relevance of initial and/or final state effects
6/25/2013
Olga EvdokimovUniversity of Illinois at Chicago
Common trend for different systems?
PHENIX and STAR Au+Au results: Quantitative studies of jet quenching Relevance of partonic DoF Higher order anisotropies from initial state
fluctuations